Cylinder-cleaner for gas-engines.



A. COFFELTI CYLINDER CLEANER FOB GAS ENGINES.

APPLICATION FILED MAYM, 1912. RENEWED JAN-2.1917:

Patented June WITNESSES fl 7H. 1 I

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ALFRED GOFFELT, OF FRIDAY HARBOR, WASHINGTON.

CYLINDER-CLEANER FOR GAS-ENGINES.

Specification of Letters Patent.

Patented June 5, 1217.

Application filed May 14, 1912, Serial No. 697,279. Renewed January 2, 1917. Serial N 0. 140,306.

To all whom it may concern:

Be it known that I, ALFRED Corrnrrr, a citizen of the United States, residing at Friday Harbor, in the county of San Juan and State of Washington, have invented new and useful Improvements in Cylinder-Cleaners for Gas-Engines, of which the following is a specification.

This inventionrelates to new and useful improvements in internal combustion engines and pertains more particularly to means for regulating the intake and exhaust of the same, and also to means for scavenging the cylinders.

The primary object of this invention is to provide devices of this character with automatic valves which will regulate the intake of the explosive gases and at the same time thoroughly clean the cylinder of the exhaust gases contained therein.

With this and other objects in View, the invention consists in the construction, combination and arrangement of parts as will be hereinafter described and claimed.

Reference is to be had to the acco1npanying drawings forming part of this specification, in which,

The figure is a side elevation, partly in section, showing the interior of the cylinder in dotted lines.

Referring more particularly to the drawings, 10 indicates an ordinary cylinder of a gas engine having mounted for reciprocation therein a piston 11, the said cylinder being provided with water jackets in the usual manner to insure the desired cooling to the piston. Extending from the piston is a piston rod 12, which is connected to and adapted to operate a crank shaft 13. 13 indicates the usual intake port for the admission of the explosive gases and 14 indicates the exhaust port. The intake port is formed at the upper end of the cylinder and the ex haust port is formed adjacent the lower extremity thereof.

In practice I have found that when the gases are admitted into the combustion chamber, some of the exhaust gases remain therein which have a tendency to fill up the combustion chamber and thereby preventing the proper explosion andalso losing a great amount of energy'in the engine. The present invention is to provide means where by the exhaust gases may be cleaned from the combustion chamber and at the same time a fresh charge of gas admitted, thereby insuring better combustion and producing a more practical and efiicient engine.

This means consists of an auxiliary piston or cylinder cleaner M, which is provided with a valve 15 having extending therefrom a valve stem 16 mounted in a piston rod 17 and spaced from the upper end thereof by means of a coiled spring 18.

To the upper end of the piston rod 16 I secure a cap 19 which is incased in a casing 20 mounted in any suitable or well known manner upon the upper face of the cylinder. The casing 20 acts as a cylinder and the cap 19 as a piston during the operation of the auxiliary piston 14.

Mounted on the side of the cylinder 10 of the gas engine is a compressed air cylinder 21 which has mounted for reciprocation therein a piston 22 which is operated by an eccentric 23 mounted on the crank shaft 13. This eccentric controls the piston 22 through the piston rod 24, which rides between the flanges 25 of the eccentric. The cylinder 21 is connected adjacent the upper extremity of the cylinder 20 by means of a pipe 26 and is connected to the cylinder 20 by means of two ports 27 and 28, the purpose of which will be hereinafter described.

The cylinder 21 is to contain compressed air of a greater volume than that contained in the cylinder 20. It will be seen through this operation that upon the upper stroke of the piston 22 thecompressed air will be forced through the pipe 26 into the cylinder 20, thereby causing the downward stroke of the auxiliary piston 14:, and upon the downward strokeof the piston 22 the compressed air will be drawn back again into cylinder 21, thereby forming a vacuum which will cause the valve rod 16 to resume its original position. The piston 19 upon an upward stroke lies above the enlarged port 28 formed in the cylinder 20 so that when the compressed air is forced into said cylinder it will first enter the port 27 forcing the piston below the port 28 and then a suitable supply of air will enter the enlarged port 28. On the upward stroke of the piston the air will pass through the ports 27 and 28, until the auxiliary piston 14 has passed beyond the large port 28, when a suitable amount will be trapped to absorb the shock caused by the upward stroke of the piston 14, the air slowly escaping through the restricted port 27 permitting the piston to complete its cycle.

7 Various changes in the form, proportion and minor details of construction may be resorted to Without departing from the prin-' ciple or sacrificing any of the advantages of this invention as claimed.

Having fully described my invention What I desire to secure by Letters Patent is:-

In a gas engine, a main cylinder having a piston operating-therein, a crank shaft in connection With said piston, an auxiliary cylinder connected to the main cylinder, a

second piston Working Within the main cyl inder, a hollow rod extending from said second piston longitudinally of the auxiliary cylinder, a cap connected to the free end of rod, said cap forming a piston Within the Copies of this patent may be obtained for auxiliary cylinder, a valve in the second piston having a stem extending longitudinally of the hollow rod and terminating in an enlarged head, a spring intermediate the enlarged head and hollow rod end, openings in the side at the upper end of the auxiliary cylinder, one of said openings being some What larger than the other, a compressor chamber connected to the main cylinder and having therein a piston inconnection with the above mentioned crank shaft, and a tubular member connecting the said chamber and auxiliary cylinder.

ALFRED COFFELT.

Vitnesses VAN E. SARGENT, CURT L. CARLIN.

five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

